Spring Data JPA 多条件查询

SELECT * FROM UserModel AS u WHERE u.sex = :sex AND u.age = :age
变化后
SELECT * FROM UserModel AS u WHERE (u.sex = :sex OR :sex == null) AND (u.age = :age OR :age == null)

T findOne(Specification<T> spec);
List<T> findAll(Specification<T> spec);
Page<T> findAll(Specification<T> spec, Pageable pageable);
List<T> findAll(Specification<T> spec, Sort sort);
long count(Specification<T> spec);

Dao

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;

import com.github.ckwen.je.spring.boot.security.model.EmployeeModel;

public interface EmployeeRepository extends JpaRepository<EmployeeModel, String>, JpaSpecificationExecutor<EmployeeModel> {

}

Service

@Override
public List<EmployeeModel> findSearch(EmployeeModel model) {

Assert.notNull(model);

List<EmployeeModel> result = employeeRepository.findAll(new Specification<EmployeeModel>() {
@Override
public Predicate toPredicate(Root<EmployeeModel> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
List<Predicate> list = new ArrayList<Predicate>();

if (StringUtils.isNoneBlank(model.getName())) {
list.add(cb.like(root.get("name").as(String.class), "%" + model.getName() + "%"));
}

if (model.getGender() != null) {
list.add(cb.equal(root.get("gender").as(GenderType.class), model.getGender()));
}

if (StringUtils.isNotBlank(model.getTelPhone())) {
list.add(cb.like(root.get("telPhone").as(String.class), "%" + model.getTelPhone() + "%"));
}

if (model.getDepartment() != null && model.getDepartment().getCode() != null) {
list.add(cb.equal(root.get("department").as(DepartmentModel.class), model.getDepartment()));
}

Predicate[] p = new Predicate[list.size()];
return cb.and(list.toArray(p));
}

});

return result;
}

Junit

@Autowired
private EmployeeService employeeService;

@Test
public void test() {

EmployeeModel model = new EmployeeModel();
model.setName("33");
model.setGender(GenderType.MALE);

List<EmployeeModel> rs = employeeService.findSearch(model);

for (EmployeeModel employeeModel : rs) {
System.out.println(employeeModel);
}
}

@Test
public void test1() {

EmployeeModel model = new EmployeeModel();
model.setDepartment(new DepartmentModel("AAA"));

List<EmployeeModel> rs = employeeService.findSearch(model);

for (EmployeeModel employeeModel : rs) {
System.out.println(employeeModel);
}
}